Question to all archers – How do you overcome a bad shot?

How do you overcome a bad shot or a poor round?
Whether this means a missed target or reduced score.
What do you say to yourself to buck yourself up or doesn’t it effect you?
What coping mechanism or strategies do you apply? 
To be honest I really struggle with this in a big way and with the NFAS national championships in a few days I’m feeling less confident than ever.
Looking forward to your answers.
Thanks for reading,